. >> he has not forgotten how difficult life once growing up in grand rapids, michigan but he seemingly does all he can to mask the memories of hardship. a few miles from the gym, this is the ode to opulence where mayweather is known to spend frequent afternoons, tobin motor cars. joining him for a browse today, r&b singer ray jay. >> limited edition. >> mayweather owns 14 luxury cars, collection valued at more than $4 million. on this visit he negotiates an impromptu trade, one of his bentleys for a new rolls royce. >> you want to come to the dealership and meet me at my house and me the difference and we will take care of it. i will give you cash. >> several hours later, back at the mayweather mansion, a man they call chop arrives with the call they call the ghost. >> rolls royce effect. we add another rolls royce to the collection, you know what i'm saying. that's what it is. all white, that's right. money men don't play. >> following a bit of paperwork, the exchange is made. a cash payment makes up the difference. >> thank you. >> appreciate another beautiful with the champ. >> we d